Water tank of solar water heater



FIG. 1 is a right side view;

FIG. 2 is a left side view;

FIG. 3 is a front view;

FIG. 4 is a rear view;

FIG. 5 is a top view; and,

FIG. 6 is a bottom view. 

The ornamental design for a water tank of solar water heater, as shown and described. 